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Fishes. Common Characteristics  Bilateral Symmetry  Fins  Gills to breathe  Endoskeleton with backbone  Bilateral Symmetry  Fins  Gills to breathe.

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Presentation on theme: "Fishes. Common Characteristics  Bilateral Symmetry  Fins  Gills to breathe  Endoskeleton with backbone  Bilateral Symmetry  Fins  Gills to breathe."— Presentation transcript:

1 Fishes

2 Common Characteristics  Bilateral Symmetry  Fins  Gills to breathe  Endoskeleton with backbone  Bilateral Symmetry  Fins  Gills to breathe  Endoskeleton with backbone

3 3 Classes  Agnatha ~60+ species  Chondrichthyes ~850 species  Osteichthyes ~20,000+ species  Agnatha ~60+ species  Chondrichthyes ~850 species  Osteichthyes ~20,000+ species

4 Agnatha - Jawless Fish

5  No Jaw  Long bodies  No scales  Cartilage skeleton  One fleshy fin  No swim bladder  No Jaw  Long bodies  No scales  Cartilage skeleton  One fleshy fin  No swim bladder

6 Agnatha: Hagfish  Scavenger  Feed on dead/dying fish (or whales!)  Drill hole and suck blood and flesh hagfish

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8 Agnatha: Lamprey  Many parasitic  Attach with sucker-like mouth  Teeth scrape flesh or suck blood  Many parasitic  Attach with sucker-like mouth  Teeth scrape flesh or suck blood

9 Chondrichthyes - Cartilaginous fish

10  Sharks, skates, and rays  Well-developed fins(paired)  Cartilage skeleton  No swim bladder  Eat anything (almost)  Sharks, skates, and rays  Well-developed fins(paired)  Cartilage skeleton  No swim bladder  Eat anything (almost)

11 Chondrichthyes - Cartilaginous fish  Skates and rays  Mouth on underside  Flap “wings”  May have sharp spines with poison glands on tail  Some generate electricity  Skates and rays  Mouth on underside  Flap “wings”  May have sharp spines with poison glands on tail  Some generate electricity

12 Tiny, toothlike scales called denticles or placoid scales on sharks

13 Osteichthyes - Bony Fish

14  Endoskeleton of bone  Scales - Ctenoid  Swim bladder  Gill covers - Operculum  Endoskeleton of bone  Scales - Ctenoid  Swim bladder  Gill covers - Operculum

15 Osteichthyes - Bony Fish  3 groups  1. Lobe-finned (7 living sp.)  2. Lung fish - gills and lungs to gulp air  3. Ray-finned - diverse  3 groups  1. Lobe-finned (7 living sp.)  2. Lung fish - gills and lungs to gulp air  3. Ray-finned - diverse

16 Shape and Movement  Pelvic and Pectoral- stablizers for turning, stopping  Dorsal - stablize fish so doesn’t flip  Caudal - main thrust for swimming

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19 Swim Bladder in bony fish

20 Coloration  Chromatophores (pigments)  Mirror-like silver - light reflecting crystals  Countershading in open ocean euphotic  Counterillumination  Chromatophores (pigments)  Mirror-like silver - light reflecting crystals  Countershading in open ocean euphotic  Counterillumination

21 Coloration  Disruptive

22 Coloration  Camouflage  Colorful  Camouflage  Colorful

23 Respiration

24  Gills extract oxygen and eliminate CO2  Lots of surface area- gill filaments  Gills extract oxygen and eliminate CO2  Lots of surface area- gill filaments

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27 Respiration  Water must flow continously past gills Bony fish: operculum Sharks : water enters through mouth or spiracle  Water must flow continously past gills Bony fish: operculum Sharks : water enters through mouth or spiracle

28 Excretory system - osmoregulation

29 Some water, CO2 and salt excreted through gills Kidneys remove wastes and salts

30 Bony fish: Drink saltwater Gills remove salt Don’t pee much(very salty) Sharks: Blood salts similar to sea Water Retain a lot of nitrogenous Waste (urea) Gills and kidneys excrete salt

31 Circulatory system: Closed, 2 chambered heart No O2 blood from body ->atrium ->ventricle->gills to Get O2 ->body O2 used->back to heart Humans: Body to heart to lungs back to heart to body

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33 Nervous System  Brain, spinal cord, excellent sense organs  Large eyes  Taste and smell: big olfactory sacs with receptors on head and entire body  Ears: don’t hear well, but have  Lateral line system  Brain, spinal cord, excellent sense organs  Large eyes  Taste and smell: big olfactory sacs with receptors on head and entire body  Ears: don’t hear well, but have  Lateral line system

34 Nervous system

35 Pores connect to fluid-filled canals under skin Sensitive to vibrations and pressure waves Detect prey, danger, swim in schools, dark murky water

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37 Digestive System  Complete digestive tract  Carnivores, herbivores, scavengers, parasites, filter feeders, go fishin’  Shark swallow food whole, have a spiral valve to digest and absorb nutrients instead of intestines  Complete digestive tract  Carnivores, herbivores, scavengers, parasites, filter feeders, go fishin’  Shark swallow food whole, have a spiral valve to digest and absorb nutrients instead of intestines

38 Digestive system

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40 Reproduction

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